ANTI-CURL LAYER FOR FLEXIBLE PHOTORECEPTOR
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
When 'flexible webs such as polymeric supporting films are coated with polymeric coatings on one side, the coated webs tend to curl. This problem may arise from shrinkage of the applied coating due to solvent evaporation or, perhaps, from a difference in the linear coefficients of thermal expansion between the web substrate and coating. Curling of the web may be prevented by applying an anti-curl coating on the opposite side of the web. The composition and thickness of the anti-curl coating should be selected to provide a balance of shrinkage forces between the anti-cur1 side and the opposite side of the web. For example, a photoreceptor comprising a polyester web bearing an adhesive coating, photoconductive coating and overlayer on one side of the Mylar web is coated on the opposite side of the web with a mixture of a polycarbonate resin and adhesive resin to a thickness of about 23 microns to yield an essentially flat photoreceptor web with no tendency to curl.